Precise Cold Drawn Seamless Steel Tube for Mechanical Processing

Cold finished (hard)

BK

Tubes do not undergo heat treatment following the final cold forming and,thus, have a rather high resistance to deformation

Cold finished (soft)

BKW

The final heat treatment is followed by cold drawing involving limited deformation.Appropriate further processing allows a certain degree of cold forming(e.g. bending expanding).

Cold finished and stress-relleved

BKS

Heat treatment is applled following the last cold forming process. Subject to appropriate processing conditions, the increase in the residual stresses involved enables both forming and machining to a certain degree

Annealed

GBK

The last cold forming process is followed by annealing in a controlled atmosphere

Normalized

NBK

The last cold forming process is followed by annealing above the upper transformation point in a controlled atmosphere

Φ13.1

1.5-3

Φ35.5

1.5-7

Φ46.1

1.5-10

Φ93

1.5-15

Φ19.25

1.5-5

Φ35.9

1.5-7

Φ47.8

1.5-10

Φ19-Φ121

1.5-15

Φ22

1.5-5

Φ36.6

1.5-7

Φ49.2

1.5-10

Φ22.2

1.5-5

Φ38

1.5-8

Φ49.5

1.5-10

Φ25

1.5-6

Φ38.4

1.5-8

Φ52.3

1.5-10

Φ26.3

1.5-6

Φ40

1.5-10

Φ53.8

1.5-10

Φ27

1.5-6

Φ40.2

1.5-10

Φ57

1.5-10

Φ28

1.5-6

Φ40.9

1.5-10

Φ59

1.5-10

Φ30

1.5-6

Φ41.3

1.5-10

Φ60

1.5-11

Φ30.25

1.5-6

Φ41.6

1.5-10

Φ62.5

1.5-11

Φ30.9

1.5-6

Φ42

1.5-10

Φ74

1.5-11

Φ31

1.5-7

Φ43

1.5-10

Φ75

1.5-11

Φ32

1.5-7

Φ44.5

1.5-10

Φ76

1.5-11

Φ35

1.5-7

Φ45.8

1.5-10

Φ89

1.5-15